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13Published 1997Subjects: “...Philosophy of nature....”
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14Published 1998Subjects: “...Nature Juvenile literature....”
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16by Césarman, Fernando C., 1925-Subjects: “...Nature Effect of human beings on....”
Published 1972
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18by Stidworthy, John, 1943-Subjects: “...Natural history Research Methodology Juvenile literature....”
Published 1993
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19by Aranguren, José Luis L., 1909-1996Subjects: “...Christianity Essence, genius, nature....”
Published 1963
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